A quick puzzle to keep things ticking over until the imminent return of the Mad Hatter. Suitable for A-level students and top-end GCSE, or even KS3. Has been known to stump maths teachers too:

#7: Gridlock
A deceptively simple puzzle. Fill in the grid.
Published: 29/07/2015
Difficulty: *
Maths knowledge required: Very basic – calculating means.

The solution will be available next week.

IMAGE: IDS.photos – Creative Commons

The giant crab that I have chosen to illustrate this post is not relevant to the puzzle, but bonus points go to anyone who knows why I have picked it and can provide an appropriate response…

DIFFICULTY RATINGS:
* – Not too taxing
** – Requires significant thought
*** – Extremely difficult
!!!! – Requires high level mathematics / Unsolved / Insoluble